239 lines
8.5 KiB
Racket
239 lines
8.5 KiB
Racket
#lang typed/racket
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(require typed-map
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typed/racket/unsafe
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"typed-syntax-convert.rkt")
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(unsafe-require/typed racket/base
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[[datum->syntax datum->syntax*]
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(∀ (A) (→ (Syntaxof Any)
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A
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(Syntaxof Any)
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(Syntaxof Any)
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(Syntaxof A)))])
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(provide ISyntaxOf
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ISyntaxOf-E
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ISyntax
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ISyntax-E
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(struct-out NonSyntax)
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;(struct-out NonSexp) ; already exported in typed-syntax-convert.rkt
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NonSyntaxOf
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NonSexpOf
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any->isyntax
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syntax->isyntax
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any->isyntax-e)
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(unsafe-require/typed racket/function
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[[identity unsafe-cast-function] (∀ (A) (→ Any A))])
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(define-syntax-rule (unsafe-cast v t)
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((inst unsafe-cast-function t) v))
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(define-type (ISyntaxOf A B)
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(Rec
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stx
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(U A
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(Syntaxof
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(U B
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Boolean
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Char
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Complex
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Keyword
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String
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Symbol
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(Boxof stx)
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Null
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(Pairof stx (Rec L (U Null
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stx
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(Pairof stx L))))
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(Vectorof stx))))))
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(define-type (ISyntaxOf-E A B)
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(U B
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Boolean
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Char
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Complex
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Keyword
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String
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Symbol
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(Boxof (ISyntaxOf A B))
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Null
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(Pairof (ISyntaxOf A B) (Rec L (U Null
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(ISyntaxOf A B)
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(Pairof (ISyntaxOf A B) L))))
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(Vectorof (ISyntaxOf A B))))
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(struct (A) NonSyntax ([value : A]) #:type-name NonSyntaxOf)
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(struct (A) NonSexp ([value : A]) #:type-name NonSexpOf)
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(define-type ISyntax (ISyntaxOf (NonSyntaxOf Any) (NonSexpOf Any)))
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(define-type ISyntax-E (ISyntaxOf-E (NonSyntaxOf Any) (NonSexpOf Any)))
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(: syntax->isyntax (→ (Syntaxof Any)
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(Values ISyntax
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(U 'modified 'unmodified))))
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(define (syntax->isyntax stx)
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(define e (syntax-e stx))
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(define-values (e* status) (any->isyntax-e e))
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(case status
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[(unmodified)
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(values (unsafe-cast e ISyntax) 'unmodified)]
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[(modified)
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(values (datum->syntax* stx e* stx stx) 'modified)]
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#;[(#f)
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(values #f #f)]))
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(: any->isyntax (→ Any
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(Values ISyntax
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(U 'modified 'unmodified))))
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(define (any->isyntax e)
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(if (syntax? e)
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(syntax->isyntax e)
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(values (NonSyntax e) 'modified)))
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(: listof-any->listof-isyntax (→ (Listof Any)
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(Pairof (Listof ISyntax)
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(U 'modified 'unmodified))))
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(define (listof-any->listof-isyntax e)
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(define e+status*
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(map (λ ([eᵢ : Any])
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(let-values ([(eᵢ* status) (any->isyntax eᵢ)])
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(cons eᵢ* status)))
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e))
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(define e* (map car e+status*))
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(define status* (map cdr e+status*))
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(cond
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[(andmap (curry eq? 'unmodified) status*)
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(cons (unsafe-cast e (Listof ISyntax)) 'unmodified)]
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#;[(ormap (curry eq? #f) status*)
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(cons #f #f)]
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[else
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(cons e* 'modified)]))
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#;(: handle-pair (case→ (→ (Listof Any)
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(Values (Listof Syntax-E)
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(U 'unmodified 'modified)))
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(→ (Pairof Any (Rec L (U Any (Pairof Any L))))
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(Values (Pairof Syntax-E
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(Rec L (U Syntax-E
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(Pairof Syntax-E L))))
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(U 'unmodified 'modified)))
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(→ Any
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(Values ISyntax
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(U 'unmodified 'modified)))))
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#;(: handle-pair (case→ (→ (Pairof Any (Listof Any))
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(Values (Listof Syntax-E)
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(U 'unmodified 'modified)))
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(→ (Pairof Any (Rec L (U Any (Pairof Any L))))
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(Values (Pairof Syntax-E
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(Rec L (U Syntax-E
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(Pairof Syntax-E L))))
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(U 'unmodified 'modified)))))
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(: handle-pair (→ (U (Pairof Any (Listof Any))
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(Pairof Any (Rec L (U Any (Pairof Any L)))))
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(Values (Pairof ISyntax
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(Rec L (U ISyntax
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Null
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(Pairof ISyntax L))))
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(U 'unmodified 'modified))))
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(define (handle-pair e)
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(let-values ([(car* status-car)
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(any->isyntax (car e))])
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(cond
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[(pair? (cdr e))
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(let-values ([(cdr* status-cdr)
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(handle-pair (cdr e))])
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(cond
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#;[(and (eq? status-car 'unmodified)
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(eq? status-cdr 'unmodified))
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(values (unsafe-cast e (Pairof ISyntax
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(Rec L (U ISyntax
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Null
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(Pairof ISyntax L)))))
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'unmodified)]
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#;[(or (eq? status-car #f)
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(eq? status-cdr #f))
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(values #f #f)]
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[else
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(values (cons car* cdr*) 'modified)]))]
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[(null? (cdr e))
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(cond
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#;[(eq? status-car 'unmodified)
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(values (unsafe-cast e (Pairof ISyntax Null)) 'unmodified)]
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#;[(eq? status-car #f)
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(values #f #f)]
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[else
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(values (cons car* (cdr e)) 'modified)])]
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[else
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(let-values ([(cdr* status-cdr)
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(any->isyntax (cdr e))])
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(cond
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#;[(and (eq? status-car 'unmodified)
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(eq? status-cdr 'unmodified))
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(values (unsafe-cast e (Pairof ISyntax
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(Rec L (U ISyntax
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Null
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(Pairof ISyntax L)))))
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'unmodified)]
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#;[(or (eq? status-car #f)
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(eq? status-cdr #f))
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(values #f #f)]
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[else
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(values (cons car* cdr*) 'modified)]))])
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#;[(null? e)
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(values e 'unmodified)]
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#;[else
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(any->isyntax e)]))
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#;(let*-values ([(car* status-car)
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(any->isyntax (car e))]
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[(cdr* status-cdr)
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(any->isyntax (cdr e))])
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(cond
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#;[(and (eq? status-car 'unmodified)
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(eq? status-cdr 'unmodified))
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(values (unsafe-cast e (ISyntax-E A)) 'unmodified)]
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#;[(or (eq? status-car #f)
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(eq? status-cdr #f))
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(values #f #f)]
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[else
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(values (cons car* cdr*) 'modified)]))
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(: any->isyntax-e (→ Any
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(Values ISyntax-E
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(U 'modified 'unmodified))))
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(define (any->isyntax-e e)
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(cond
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[(boolean? e) (values e 'unmodified)]
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[(char? e) (values e 'unmodified)]
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[(number? e) (values e 'unmodified)]
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[(keyword? e) (values e 'unmodified)]
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[(null? e) (values e 'unmodified)]
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[(string? e) (if (immutable? e)
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(values e 'unmodified)
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(values (string->immutable-string e) 'modified))]
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[(symbol? e) (values e 'unmodified)]
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[(box? e) (let-values ([(u* status) (any->isyntax (unbox e))])
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(case status
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[(unmodified)
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;(if (immutable? e)
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;(values (unsafe-cast e (Sexpof A)) 'unmodified)
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(values (box-immutable u*) 'modified);)
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]
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[(modified)
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(values (box-immutable u*) 'modified)]
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#;[(#f)
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(values #f #f)]))]
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[(pair? e) (handle-pair e)]
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[(vector? e) (match-let ([(cons vs* status)
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(listof-any->listof-isyntax (vector->list e))])
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(case status
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[(unmodified)
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(if (immutable? e)
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(values (unsafe-cast e ISyntax-E) 'unmodified)
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(values (apply vector-immutable vs*) 'modified))]
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[(modified)
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(values (apply vector-immutable vs*) 'modified)]
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#;[(#f)
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(values #f #f)]))]
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[else
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(values (NonSexp e) 'modified)])) |